A History of Inventions, Discoveries, and Origins, Volume 2 (of 2)Note 1256 — SALTPETRE. GUNPOWDER. AQUAFORTIS.William Johnston translationSymbola Aureæ Mensæ. Francof. 1617, 4to, lib. vii. p. 335.◇Copy noteReturn to SALTPETRE. GUNPOWDER. AQUAFORTIS.